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physics > revion topic 14 > Flashcards

revion topic 14 Flashcards

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1
Q

what is an ion

A

a charged atom

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2
Q

what are insulators

A

they are substances that can’t conduct electricity

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3
Q

what happens if you rub polythene rod on dry clothes

A

electrons would move from the surface of the clothes to the rod making them negatively charged

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4
Q

what happens if you rub perspex rod on dry clothes

A

electrons would move from the rod to the surface of the clothes making the rod positively charged

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5
Q

like charges?

A

repel

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6
Q

unlike charges?

A

attract

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7
Q

what is the function of the cell

A

it pushes the electrons around a complete circuit

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8
Q

what is the function of a switch

A

it enables the current to be switched on or off

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9
Q

what is the function of the indicator

A

its function is to emit light once a circuit is going through it

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10
Q

what is the function of the diode

A

it allows the current trough only one direction

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11
Q

what is the function of the light-emitting diode

A

does the same job as a normal diode but emits light when a current is passing through it

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12
Q

what is the function of the ammeter

A

to measure the current of a circle

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13
Q

what is the function of a fixed resistor

A

it limits the current in a circuit

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14
Q

what is the function a variable resistor

A

allows the current to be varied

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15
Q

what is the function of the fuse

A

it is designed to melt, breaking the circuit if the current passing thought it is greater than a certain amount

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16
Q

what is the function of the heater

A

transfer electrical signal to heat the surroundings

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17
Q

what is the function of the voltmeter

A

it is used to measure the potential difference

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18
Q

what is an electrical current

A

it is the flow of charge

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19
Q

what is the size of an electric current

A

it is the rate of following of electrical charge

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20
Q

what happens when you turn torch on

A

millions of currents would pass through the torch and the lamp every second, as then electrons would pass through the filament since it made of electrons, them electrons would transfer energy from the cell to the touch

21
Q

what is electrical charge is measured in

A

coulombs (C)

22
Q

electrical current is measured in

A

amperes (A)

23
Q

current =

A

charge flow/time taken

24
Q

what happens if an ammeter is in series with the lamp?

A

the same amount of current would pass through them

25
Q

what is the potential difference

A

it is the energy transferred to the lamp

26
Q

what happens if the voltmeter is connected parallel to the torch lamp

A

it would measure the potential difference across it

27
Q

potenial diffrence across a componetent=

A

energy transferred/charge

28
Q

resistance =

A

pontentail difference/current

29
Q

what is the unit of resistance

A

ohms

30
Q

what does the ohms law state

A

that a current through a resistor at constant temperature is directly proportional to the potential difference across the resistor, the wire would be known as an ohmic conductor

31
Q

what will happen in a current-potential difference graph in filament light

A

it is not directly proportional because the line would cure towards the end because as the current increases the resistance increases, so as the filament lamp temperature increase the resistance would, and this is because the ions in the filament light would stay vibrating faster making it harder for the electrons to pass through, reversing the potential difference won’t change anything

32
Q

what will happen in a current-potential difference graph in the diode

A

the diode isn’t an ohmic conductor since it would curve toward the y-axis in a forward direction, and if you reverse the direction the current would be virtually zero so there would be a higher distance in the reverse direction

33
Q

what will happen in a current-potential difference graph in thermistor

A

it is an ohmic conductor, and as the temperature increases its resistance decreases

34
Q

what will happen in a current-potential difference graph in LDR

A

it is an ohmic conductor, and if the brightness of the light is increased them the resistance would decrease

35
Q

what happens to a current in a series circuit

A

the current would pass through each component

36
Q

what happens to the potential difference in a series circuit

A

the total potential difference of voltage supplied is shared between each component

37
Q

what happens to the potential difference if there was more than one cell in a series circuit

A

the total potential difference of cells in a series is the sum of the potential difference of each cell

38
Q

what happens to resistance in a series circuit

A

the total resistance of components in a series is equal to sum of the resistance in each component

39
Q

what happens to the current in a parallel circuit

A

the total current through the whole circuit is the sum of the currents through the separate components

40
Q

what happens to the potential difference in a parallel circuit

A

the potential difference across each component is the same

41
Q

the bigger the resistance in a component in a parallel circuit

A

the smaller the current is, as it can be represented as

current = potential difference/ resistance

42
Q

what is a sensor circuit

A

it is a circuit made up of two or more resistors in a circuit connected to a source of fixed p.d, where the fixed p.d is shared between the two resistors

43
Q

what does a temperature sensor include

A

thermistor

44
Q

what happens if you increase the temperature in a temperature sensor

A

the resistance would decrease so the battery shared p.d decreases as well

45
Q

what does a light sensor include

A

an LDR

46
Q

what happens if you increase the brightness in a light sensor

A

the resistance would decrease so the shared battery p.d decreases as well, because of this the share of battery p.d across resistor increases

47
Q

what is a rely

A

it is an electrical operant switch used in electrical circuits to switch machines on and off

48
Q

how does a temperature operant alarm work

A

so if the thermistor is cold there won’t be enough resistance to turn on the buzzer, so when you increase the temperature of the thermistor there would be enough temperature to turn the busser

49
Q

what happens if a resistor is which out in a sensor to a variable resistor

A

when the temperature increase the resistance would increase

physics (18 decks)

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